DM9000驱动程序详解

//arch/arm/mach-s5pv210/mach-smdkv210.c/*片选信号使用的是XM0CSn1,查看S5PV210的芯片手册内存映射一节可以找到SROM BANK1的地址范围是0x8800_0000 --0x8FFF_FFFF，   则访问这个范围的地址时会激活片选使能信号XM0CSn1*/#define S5PV210_PA_DM9000_A     (0x88001000) #define S5PV210_PA_DM9000_F     (S5PV210_PA_DM9000_A + 0x300C)//static struct resource smdkv210_dm9000_resources[] = {    [0] = {        .start  = S5PV210_PA_DM9000_A, //地址线        .end    = S5PV210_PA_DM9000_A + SZ_1K*4 - 1,        .flags  = IORESOURCE_MEM,    },    [1] = {        .start  = S5PV210_PA_DM9000_F, //数据线        .end    = S5PV210_PA_DM9000_F + SZ_1K*4 - 1,        .flags  = IORESOURCE_MEM,    },      [2] = {         .start  = IRQ_EINT(7),        .end    = IRQ_EINT(7),        .flags  = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHLEVEL,//中断资源和高频存储发资源    },};

//arch/arm/mach-s5pv210/mach-smdkv210.cstatic struct dm9000_plat_data smdkv210_dm9000_platdata = { .flags = DM9000_PLATF_16BITONLY | DM9000_PLATF_NO_EEPROM, //16bit模式 .dev_addr = { 0x08, 0x90, 0x00, 0xa0, 0x02, 0x10 }, //设置网卡的物理地址 };struct platform_device smdkv210_dm9000 = {    .name       = "dm9000",  //平台设备名    .id     = -1,    .num_resources  = ARRAY_SIZE(smdkv210_dm9000_resources), //资源数组个数    .resource   = smdkv210_dm9000_resources, //资源数组    .dev        = {        .platform_data  = &smdkv210_dm9000_platdata, //平台设备数据    },};static struct platform_device *smdkv210_devices[] __initdata = {     ...&smdkv210_dm9000,...};static void __init smdkv210_dm9000_init(void){    unsigned int tmp;    gpio_request(S5PV210_MP01(1), "nCS1");    s3c_gpio_cfgpin(S5PV210_MP01(1), S3C_GPIO_SFN(2));    gpio_free(S5PV210_MP01(1));    tmp = (5 << S5P_SROM_BCX__TACC__SHIFT);    __raw_writel(tmp, S5P_SROM_BC1);    tmp = __raw_readl(S5P_SROM_BW);    tmp &= (S5P_SROM_BW__CS_MASK << S5P_SROM_BW__NCS1__SHIFT);    tmp |= (1 << S5P_SROM_BW__NCS1__SHIFT);    __raw_writel(tmp, S5P_SROM_BW);}static void __init smdkv210_machine_init(void){s3c_pm_init();    smdkv210_dm9000_init(); //dm9000初始化....    platform_add_devices(smdkv210_devices, ARRAY_SIZE(smdkv210_devices));//将所有设备添加到系统};MACHINE_START(SMDKV210, "SMDKV210")    /* Maintainer: Kukjin Kim <[e-mail]> */    .boot_params    = S5P_PA_SDRAM + 0x100,    .init_irq   = s5pv210_init_irq,    .map_io     = smdkv210_map_io,    .init_machine   = smdkv210_machine_init, //机器初始化    .timer      = &s5p_timer,MACHINE_END

//drivers/base/platform.cint platform_add_devices(struct platform_device **devs, int num){       int i, ret = 0;    for (i = 0; i < num; i++) {        ret = platform_device_register(devs[i]);        if (ret) {              while (--i >= 0)                platform_device_unregister(devs[i]);            break;          }    }    return ret;}